OK, so I've been searching for a while now and can't even find the right words to type into Google without it mistaking me for wanted to cast something from a phone.

Let me explain.

I have a nvidia shield android TV in the living room hooked up to hdmi receiver and from there to the TV. In the kitchen there is a Nest Hub smart display (chromecast with speaker and screen). Is there any way to copy whats onscreen on the living room tv/soundset to the kitchen smart? Is there a way to automatically cast the output of the nvidia shield to the nest hub in the kitchen.

I have home assistant and Logitech harmony elite if that matters. I'm not looking for 2 way control, for now mostly just copy what's on screen to the kitchen.

I know some Samsung tv's had an app that did something like this but couldn't find anything related to Android TV.